Add pry-plus to the Gemfile. Add test for sets the opponent for each player.
Edit test for increment points of a winning player. Edit method wins_ball to increment by 1 and pass test.
Edit score test for points at 0,1,2,3. Add code so that player.score  methods passes.
Add test for when both players have 4 points/duece. Add code to score method to pass test.
Add test for when one  player has  4 points and opponent has 2 or less. Add code to score method to pass test.
Add test for when one player has 5 points and opponent has 4 points. Add code to score method to pass test.
Add test for when one player has 6 points and opponent has 4 points. Add code to score method to pass test.
Add test for when both players have 5 points. Add code to score method to pass test.
Finalize tests and score method.
A few final edits for pull request sent to MKS.